RUN! You have to ask? RUN!
You're dating a serial abuser. He won't change. Now he's starting in on you. It will only go downhill from here. You'll hit back and he'll hit you harder. One day soon he'll put you in the hospital.
Leave. Now. If he's sorry for his violent tendencies and trying to do better, good. Leave anyway. You don't have to be there taking the beatings while he figures it out.
Please get away from this guy before he hurts you.
Thanks for the question.